<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 添加角色 -->
      <el-row :gutter="20">
        <el-col :span="4">
          <el-button type="primary">
            添加角色
          </el-button>
        </el-col>
      </el-row>
      <!-- 角色列表 -->
      <el-table :data="rolessList" style="width: 100%" border fit stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['vcenter', 'bdbottom', index === 0 ? 'bdtop' : '']"
              v-for="(item, index) in scope.row.children"
              :key="item.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item.id)">
                  {{ item.authName }}
                </el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限和三级权限 -->
              <el-col :span="19">
                <el-row
                  :class="['vcenter', index2 === 0 ? '' : 'bdtop']"
                  v-for="(item1, index2) in item.children"
                  :key="item1.id"
                >
                  <!-- 渲染二级权限 -->
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item1.id)"
                    >
                      {{ item1.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 渲染三级权限 -->
                  <el-col :span="18">
                    <!-- 渲染三级级权限 -->
                    <el-tag
                      v-for="item2 in item1.children"
                      :key="item2.id"
                      type="warning"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                    >
                      {{ item2.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column type="index"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"></el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">
              编辑
            </el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">
              删除
            </el-button>
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
            >
              分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defaultKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="assignPermissions">
          确 定
        </el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 角色列表
      rolessList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限列表
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认勾选的节点的key数组
      defaultKeys: [],
      // 即将分配权限的角色id
      roleId: ''
    }
  },
  created() {
    // 获取所有角色列表
    this.getRolesList()
  },
  methods: {
    // 获取角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
      this.rolessList = res.data
    },
    // 根据id删除权限
    async removeRightById(role, rightId) {
      // 弹出删除确认框
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 调用接口,删除角色指定权限
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
      // 将返回的权限列表重新赋给角色,避免重新刷新角色列表
      role.children = res.data
    },
    // 分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的树形结构
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.rightsList = res.data
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defaultKeys)
      // 显示分配权限对话框
      this.setRightDialogVisible = true
    },
    // 递归获取角色下所有的三级权限id,并保存到defaultKeys数组中
    getLeafKeys(node, arr) {
      // 如果当前node节点不包含children属性,则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defaultKeys = []
    },
    // 点击确定按钮,为指定角色分配权限
    async assignPermissions() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        {
          rids: keys.join(',')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('权限分配失败!')
      }
      this.$message.success('权限分配成功!')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
